OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP002 for Model CP48P448P405011CP

This is the factory OEM Direct Spark Ignition (DSI) control board for the Carrier CP48P448P405011CP packaged unit. The DSI control board serves as the brain of the heating system, orchestrating the ignition sequence including inducer startup, spark ignition timing, flame verification, and gas valve activation. When this board fails, common symptoms include repeated ignition lockout, no-heat calls with a running inducer but no spark, erratic cycling, or a completely unresponsive heating system despite a functioning thermostat and power supply.

• Specs: Direct Spark Ignition (DSI) control board | OEM Part Number: LH33WP002 | Factory-matched board layout and terminal configuration | 24V control circuit compatible | Designed for Carrier CP48 series packaged gas/electric units
• OEM vs Generic: This OEM board is programmed with Carrier's exact ignition timing, lockout retry logic, and fault detection parameters. Aftermarket boards often use generic timing curves that can cause nuisance lockouts, improper flame response, or voided equipment warranties — always choose OEM for control boards.
• Install difficulty: 3/5 — Requires disconnecting 24V and line-voltage wiring harnesses. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, phone or camera to document wiring before removal, and a multimeter to verify 24V supply. Always disconnect power at the disconnect switch before servicing. Not recommended for DIY without prior HVAC experience.
• Warranty: 1-year OEM factory warranty against defects. In-stock units ship same business day when ordered before 3PM local time.

Compatibility: This control board is the OEM-specified replacement for the Carrier CP48P448P405011CP packaged gas/electric unit. The CP48 series is a commercial-grade Carrier packaged rooftop/ground-level unit. Confirm your existing board's part number matches LH33WP002 before ordering. If your data plate or existing board label differs, contact our fitment team — we verify compatibility before every order ships.